Achinger, PiotrWitaszek, JakubZdanowicz, Maciej2021-07-032021-07-032021-07-032021-01-0110.4171/JEMS/1063https://infoscience.epfl.ch/handle/20.500.14299/179689WOS:000658593500004We formulate a conjecture characterizing smooth projective varieties in positive characteristic whose Frobenius morphism can be lifted modulo p(2)-we expect that such varieties, after a finite stale cover, admit a toric fibration over an ordinary abelian variety. We prove that this assertion implies a conjecture of Occhetta and Wigniewski, which states that in characteristic zero a smooth image of a projective toric variety is a toric variety. To this end we analyse the behaviour of toric varieties in families showing some generalization and specialization results. Furthermore, we prove a positive characteristic analogue of Winkelmann's theorem on varieties with trivial logarithmic tangent bundle (generalizing a result of Mehta-Srinivas), and thus obtaining an important special case of our conjecture. Finally, using deformations of rational curves we verify our conjecture for homogeneous spaces, solving a problem posed by Buch-Thomsen-Lauritzen-Mehta.Mathematics, AppliedMathematicsfrobenius liftingtoric varietyabelian varietytrivial log tangent bundleprojective-manifoldsvarietiesfamiliesbundlestext::journal::journal article::research article